Well here's my two cents for you, AFarhat. First off, the first time I read your username, I quickly read it as "a fart," but that's probably just my childish mind finding farts funny.. Now, as to the images, I don't believe the PD would find much evidentiary value to them, however, none of us know the facts surrounding this incident, so therefore none of us are qualified to say whether or not these particular images would be of any evidentiary value to their case. They may be, they may not be, but they're the only ones who could answer that question. However, what I can say, from first hand experience, is that it is nice when someone comes down to the PD and offers photos of us "in the fray," so to speak. Images like these are generally really appreciated by both law enforcement and fire/EMS services for our department or personal scrap books. As we can never take the time during the chaos of the incident to step back and snap a photo, we do appreciate people bringing us theirs.
So, take them down, offer them up, and if they tell you they would be helpful as evidence, and they want to take down your information and you're not comfortable with it, simply decline or tell them you wish to remain anonymous. There's nothing wrong with that. If they ask why, tell them you don't want the hassle of being subpoena'd. Just because something comes from an anonymous source doesn't mean we can't use it. If they don't need them as evidence, offer them up for the department to use them for their scrap books. The fire dept. would probably also appreciate them for their collection.
And the photos are cool, by the way!